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Fix -Wundef warnings.  This was addressed upstream as part of this
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commit:
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commit c7aec4beb13f125948884d80158f11c34239c61f
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Author: Will Newton <will.newton@linaro.org>
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Date:   Tue Jun 24 14:19:36 2014 +0100
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    sysdeps/posix/tempname.c: Merge from gnulib
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diff --git a/sysdeps/posix/tempname.c b/sysdeps/posix/tempname.c
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index 2f0bfef34fa31c28..05c88bc95e72756e 100644
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--- a/sysdeps/posix/tempname.c
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+++ b/sysdeps/posix/tempname.c
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@@ -40,30 +40,30 @@
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 # define __GT_NOCREATE	2
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 #endif
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-#if STDC_HEADERS || _LIBC
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+#if _LIBC || STDC_HEADERS
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 # include <stddef.h>
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 # include <stdlib.h>
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 # include <string.h>
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 #endif
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-#if HAVE_FCNTL_H || _LIBC
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+#if _LIBC || HAVE_FCNTL_H
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 # include <fcntl.h>
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 #endif
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-#if HAVE_SYS_TIME_H || _LIBC
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+#if _LIBC || HAVE_SYS_TIME_H
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 # include <sys/time.h>
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 #endif
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-#if HAVE_STDINT_H || _LIBC
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+#if _LIBC || HAVE_STDINT_H
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 # include <stdint.h>
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 #endif
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-#if HAVE_UNISTD_H || _LIBC
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+#if _LIBC || HAVE_UNISTD_H
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 # include <unistd.h>
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 #endif
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 #include <sys/stat.h>
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-#if STAT_MACROS_BROKEN
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+#if !_LIBC && STAT_MACROS_BROKEN
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 # undef S_ISDIR
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 #endif
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 #if !defined S_ISDIR && defined S_IFDIR
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@@ -101,7 +101,7 @@
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 # define __xstat64(version, path, buf) stat (path, buf)
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 #endif
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-#if ! (HAVE_SECURE_GETENV || _LIBC)
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+#if ! (_LIBC || HAVE_SECURE_GETENV)
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 # ifdef HAVE___SECURE_GETENV
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 #  define __libc_secure_getenv __secure_getenv
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 # else
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@@ -267,7 +267,7 @@ __gen_tempname (char *tmpl, int suffixlen, int flags, int kind)
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 #ifdef RANDOM_BITS
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   RANDOM_BITS (random_time_bits);
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 #else
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-# if HAVE_GETTIMEOFDAY || _LIBC
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+# if _LIBC || HAVE_GETTIMEOFDAY
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   {
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     struct timeval tv;
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     __gettimeofday (&tv, NULL);